Fix T64138: Windows Ink continuous grab at window edge.

WM_POINTERLEAVE occurs when the pen goes out of range or when a
hovering pen leaves the window's boundary. When leaving the window
boundary the xy position is invalid for some Wacom devices.

This change removes creation of GHOST_EventCursor during
WM_POINTERLEAVE events. This prevents unexpected jumping behavior
during continuous grab.

intern/ghost/intern/GHOST_SystemWin32.cpp

@@ -1137,11 +1137,6 @@ void GHOST_SystemWin32::processPointerEvent(
       break;
     case WM_POINTERLEAVE:
       window->m_tabletInRange = false;
-      system->pushEvent(new GHOST_EventButton(pointerInfo[0].time,
-                                              GHOST_kEventCursorMove,
-                                              window,
-                                              pointerInfo[0].buttonMask,
-                                              pointerInfo[0].tabletData));
       break;
     default:
       break;